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IPMC7126E/7616E I/O Module Installation and Use (6806800A45B)
Chapter 1 Product Features
8
ISA Local Resource Bus
PCI-to-ISA Bridge (PIB)
The PIB (W83C554F) contains the ISA Bridge I/O Registers necessary for various functions.
These registers are also accessible from the PCI bus.
Super I/O
The Super I/O device (PC97307) provides the following functions on the IPMC:
■ Two synchronous serial ports (COM1 and COM2)
■ Parallel printer port
ESCC
Two DTE synchronous/asynchronous serial ports are provided by the ESCC device (Z85230).
Since the Z85230 device does not have all modem control lines, a Z8536 CIO device (described
below) is used to provide the missing lines.
A PAL device is used to perform decode for the Z85230 and the Z8536 for register accesses
and pseudo interrupt acknowledge cycles in the ISA I/O space. DMA supports for the Z85230
is provided by the PIB.
The clock input to the Z85230 PCLK pin is a 10 MHz clock. The Z85230 supplies an interrupt
vector during a pseudo interrupt acknowledge cycle. The vector is modified based upon the
interrupt source within the device.
All modem control lines from the ESCC are multiplexed/demultiplexed through connector P2 by
the P2MX function due to pin limitation of the connector.
CIO
The CIO device (Z8536) is used to provide the modem control lines not provided by the Z85230
ESCC. In addition, the device has three independent 16-bit counters/timers. The clock input to
the Z8536 PCLK pin is a 5 MHz clock.
Static ROM (SROM)
Both modules contains one +3.3V, 256 x 8 serial EEPROM device (AT24C02) onboard. This
device provides for Vital Product Data (VPD) storage of the module hardware configuration. The
serial EEPROM is located on the baseboard’s I
2
C bus at address $A4.